Bend test
The bend test checks the ductility and crack resistance of a material or weld specimen by bending it. It quickly reveals lack of fusion and embrittlement.
Physicochemical mechanism of action
In the bend test, a specimen is bent around a fixed mandrel, simulating the mechanical stress on the material structure. This shows how well the material deforms under stress and whether it has cracks or embrittlement.
Metallurgical relevance & risks in welding
A failed bend test indicates poor ductility, excessive hardness, or lack of fusion. This can lead to cracks in the weld and impair mechanical strength.
Workshop practice & instructions
For the bend test, a specimen is bent around a defined mandrel, e.g., 90° or 180°. The stress must be increased continuously until the specimen suddenly breaks. The maximum stress is the bending moment and indicates how ductile the material is.